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The link in your post to the script is broken. As I recall, both the occurrence of and the intensity of the 'earthquake' are random at each page load. Perhaps you got a very low intensity quake the second time and/or your window size was already so close to the quake size that it was hardly noticeable. Try clearing your cache, closing all open browsers and opening the browser with the window at about 3 quarters of maximum size and return to the page.

The only other thing I can think of is that perhaps your host disabled the script but, I doubt that. Most likely they would have done so automatically from the very first time if they were going to do it at all.